Enterprise Architecture at Microsoft
We do it too :)
Nick has a small write-up on some of their challenges and how we communicate EA to our internal business divisions and IT (i.e., product teams). Obviously an EA operational model at a vendor such as Microsoft is a bit different than a traditional enterprise however the principles are still the same.
Check it out:
https://blogs.msdn.com/nickmalik/archive/2007/03/22/understanding-enterprise-architecture.aspx